Now I know why. One of my cousins called me tonight - he'd had a call from the Public Trustee's office who were trying to trace Betty Jean's relatives, as she had died in November last year.
All that time. Imagine that - 85 years spent in institutions, never knowing you had a family out there in the real world, never having that connection with people that loved and accepted her. I'm going to see what I can find out about her, although I don't hold out much hope. And it's too much to hope that her life was a good one.